Email alert
1987 Vol. 9, No. 1
column
Display Method:
1987, 9(1): 1-10.
Abstract:
A new implementation of the DFT based on delta modulation (DM) is proposed. It is different from the conventional implementation based on PCM. The hardware structure of the method is constructed without A/D converter and multiplier, so it is simpler ...
A new implementation of the DFT based on delta modulation (DM) is proposed. It is different from the conventional implementation based on PCM. The hardware structure of the method is constructed without A/D converter and multiplier, so it is simpler ...
1987, 9(1): 11-16.
Abstract:
The equation of electric field radiated by the current f electron beam in a waveguide with arbitrary cross-section is derived. In this equation, the ordinany dyadic Green s function is replaced by the modified one in which the eigenfield is normalize...
The equation of electric field radiated by the current f electron beam in a waveguide with arbitrary cross-section is derived. In this equation, the ordinany dyadic Green s function is replaced by the modified one in which the eigenfield is normalize...
1987, 9(1): 17-27.
Abstract:
The analysis and computation of the field distribution of the saddle deflection coil with a ferromagnetic shield by the boundary element method are described, and the limitations of the model proposed by D. M. Fye (1979) is pointed out. The Green s f...
The analysis and computation of the field distribution of the saddle deflection coil with a ferromagnetic shield by the boundary element method are described, and the limitations of the model proposed by D. M. Fye (1979) is pointed out. The Green s f...
1987, 9(1): 28-41.
Abstract:
In electron focusing and deflection systems the method of dynamic correction (i.e. the application of field curvature correction lenses and stigmators) can significantly reduce the overall aberration and greatly improve the optical properties of syst...
In electron focusing and deflection systems the method of dynamic correction (i.e. the application of field curvature correction lenses and stigmators) can significantly reduce the overall aberration and greatly improve the optical properties of syst...
1987, 9(1): 42-51.
Abstract:
During the activation and aging, the evaporation components and rates from 4.56:1.44:2 impregnated dispenser cathode have been determined by the vapor-collect method based on AES. (1) the evaporation rate of a cathode after aging differs from that of...
During the activation and aging, the evaporation components and rates from 4.56:1.44:2 impregnated dispenser cathode have been determined by the vapor-collect method based on AES. (1) the evaporation rate of a cathode after aging differs from that of...
1987, 9(1): 82-84.
Abstract:
In this paper, a small horizontal size (0.5 ) backfire antenna using circular dipole is proposed. The antenna structure, radiation characteristic and experimental results are given. The experimental results demonstrate that the antenna has better ele...
In this paper, a small horizontal size (0.5 ) backfire antenna using circular dipole is proposed. The antenna structure, radiation characteristic and experimental results are given. The experimental results demonstrate that the antenna has better ele...
1987, 9(1): 85-89.
Abstract:
In this paper, a new and general formula of capacitance of a capacitor with anisotropic dielectric shown by generalized orthogonal coordinate and inverse matrix of dielectric constant is derived by use of the displacement current, It provides a new a...
In this paper, a new and general formula of capacitance of a capacitor with anisotropic dielectric shown by generalized orthogonal coordinate and inverse matrix of dielectric constant is derived by use of the displacement current, It provides a new a...
1987, 9(1): 90-95.
Abstract:
A low-noise 1.2-1.8 GHz cooled GaAs FET amplifier with mixer bias circuit is reported. The amplifier noise temperature obtained at 20 K ambient in the frequency range of 1.2-1.7 GHz is 10 K. The lowest noise temperature is 4 K. The gain is about 30 d...
A low-noise 1.2-1.8 GHz cooled GaAs FET amplifier with mixer bias circuit is reported. The amplifier noise temperature obtained at 20 K ambient in the frequency range of 1.2-1.7 GHz is 10 K. The lowest noise temperature is 4 K. The gain is about 30 d...
1987, 9(1): 52-58.
Abstract:
The contents, classifications, features and tasks of the power electronics are expounded, and some our own ideas based on foreign research results and our institute work in recent years are proposed. These ideas presented here are for discussion in o...
The contents, classifications, features and tasks of the power electronics are expounded, and some our own ideas based on foreign research results and our institute work in recent years are proposed. These ideas presented here are for discussion in o...
1987, 9(1): 59-72.
Abstract:
The kinetic theory based on the expansion of local field in the guiding center coordinate system, presented by Liu Shenggang (1979, 1981), has successfully developed into a theoretical system. A brief discussion about the mathematical background and ...
The kinetic theory based on the expansion of local field in the guiding center coordinate system, presented by Liu Shenggang (1979, 1981), has successfully developed into a theoretical system. A brief discussion about the mathematical background and ...
1987, 9(1): 73-81.
Abstract:
In this paper, the physical basis of kinetic theory based on the guiding center coordinate system is discussed. And what phenomena happened in gyrotron will be obtained by this theory is also discussed. According to above mentioned discussion, the ad...
In this paper, the physical basis of kinetic theory based on the guiding center coordinate system is discussed. And what phenomena happened in gyrotron will be obtained by this theory is also discussed. According to above mentioned discussion, the ad...
